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1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 // <streambuf>
11 
12 // template <class charT, class traits = char_traits<charT> >
13 // class basic_streambuf;
14 
15 // streamsize in_avail();
16 
17 #include <streambuf>
18 #include <cassert>
19 
20 int showmanyc_called = 0;
21 
22 template <class CharT>
23 struct test
24     : public std::basic_streambuf<CharT>
25 {
26     typedef std::basic_streambuf<CharT> base;
27 
testtest28     test() {}
29 
setgtest30     void setg(CharT* gbeg, CharT* gnext, CharT* gend)
31     {
32         base::setg(gbeg, gnext, gend);
33     }
34 protected:
showmanyctest35     std::streamsize showmanyc()
36     {
37         ++showmanyc_called;
38         return 5;
39     }
40 };
41 
main()42 int main()
43 {
44     {
45         test<char> t;
46         assert(t.in_avail() == 5);
47         assert(showmanyc_called == 1);
48         char in[5];
49         t.setg(in, in+2, in+5);
50         assert(t.in_avail() == 3);
51     }
52 }
53